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Potassium
Test CodeLAB114
Alias/See Also
K
CPT Codes
84132
Preferred Specimen
4.5 ml (600 ul min) lithium heparin (green); alternate-SST (gold) or Red (no additive)
Minimum Volume
1 ml (200 ul minimum) plasma; alternate-serum
Other Acceptable Specimens
Gold SST
Instructions
After centrifugation, if not in gel barrier tube, pour off plasma or serum into an aliquot tube
Transport Temperature
Room Temp
Specimen Stability
Separated from cells: 24 hours room temp, 7 days refrigerated
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis: Any, Icteric: >30 mg/dL bilirubin, Lipemia: >500 mg/dL triglycerides
Methodology
Ion-Selective Electrode (ISE)
Setup Schedule
Mon- Sun
Reference Range
3.3-5.1 meq/L
Clinical Significance
Electrolytes affect most metabolic processes. They serve to maintain osmotic pressure and hydration of various body fluid
compartments, proper body pH and regulation of appropriate heart and muscle functions. Electrolytes are also involved in
oxidation-reduction reactions and participate as essential parts or, cofactors, in enzyme reactions
compartments, proper body pH and regulation of appropriate heart and muscle functions. Electrolytes are also involved in
oxidation-reduction reactions and participate as essential parts or, cofactors, in enzyme reactions
Performing Laboratory
Piedmont Athens Regional
